Mathematics · Speed, Time and Distance
A person bursts a firecracker midway between two parallel walls. The person hears the first echo of the sound 2 seconds later and the second echo 4 seconds later. If sound travels at a speed of 336 m/s, what is the distance between the two walls?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 11800 m
- 21080 m
- 31008 m✓
- 42016 m
Correct answer
1008 m
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